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Auto merge of #133955 - bjorn3:cc_pass_arch_only, r=ChrisDenton
Pass the arch rather than full target name to windows_registry::find_tool
The full target name can be anything with custom target specs. Passing just the arch wasn't possible before cc 1.2, but is now thanks to https://github.com/rust-lang/cc-rs/pull/1285.
try-job: i686-msvc
